public IEnumerable <TransitionRecord> GetInboundTransitions(ActivityRecord activityRecord)
{
return(_workflowRecord.WorkflowDefinitionRecord
.TransitionRecords
.Where(transition =>
transition.DestinationActivityRecord == activityRecord
).ToArray());
}
public IEnumerable <TransitionRecord> GetOutboundTransitions(ActivityRecord activityRecord, LocalizedString outcome)
{
return(_workflowRecord.WorkflowDefinitionRecord
.TransitionRecords
.Where(transition =>
transition.SourceActivityRecord == activityRecord &&
transition.SourceEndpoint == outcome.TextHint
).ToArray());
}
public IEnumerable<ActivityRecord> ExecuteWorkflow(WorkflowContext workflowContext, ActivityRecord activityRecord, IDictionary<string, object> tokens)
{
var firstPass = true;
var scheduled = new Stack<ActivityRecord>();
scheduled.Push(activityRecord);
var blocking = new List<ActivityRecord>();
while (scheduled.Any()) {
activityRecord = scheduled.Pop();
var activityContext = CreateActivityContext(activityRecord, tokens);
// while there is an activity to process
if (!firstPass){
if (activityContext.Activity.IsEvent) {
blocking.Add(activityRecord);
continue;
}
}
else {
firstPass = false;
}
// signal every activity that the activity is about to be executed
var cancellationToken = new CancellationToken();
InvokeActivities(activity => activity.OnActivityExecuting(workflowContext, activityContext, cancellationToken));
if (cancellationToken.IsCancelled) {
// activity is aborted
continue;
}
var outcomes = activityContext.Activity.Execute(workflowContext, activityContext).ToList();
// signal every activity that the activity is executed
InvokeActivities(activity => activity.OnActivityExecuted(workflowContext, activityContext));
foreach (var outcome in outcomes) {
// look for next activity in the graph
var transition = workflowContext.Record.WorkflowDefinitionRecord.TransitionRecords.FirstOrDefault(x => x.SourceActivityRecord == activityRecord && x.SourceEndpoint == outcome.TextHint);
if (transition != null) {
scheduled.Push(transition.DestinationActivityRecord);
}
}
}
// apply Distinct() as two paths could block on the same activity
return blocking.Distinct();
}
public override void Execute(RecipeExecutionContext context) {
foreach (var workflowDefinitionElement in context.RecipeStep.Step.Elements()) {
var workflowName = workflowDefinitionElement.Attribute("Name").Value;
Logger.Information("Importing workflow '{0}'.", workflowName);
try {
var workflowDefinition = GetOrCreateWorkflowDefinition(workflowName);
var activitiesElement = workflowDefinitionElement.Element("Activities");
var transitionsElement = workflowDefinitionElement.Element("Transitions");
var activitiesDictionary = new Dictionary<int, ActivityRecord>();
workflowDefinition.Enabled = Boolean.Parse(workflowDefinitionElement.Attribute("Enabled").Value);
foreach (var activityElement in activitiesElement.Elements()) {
var localId = Int32.Parse(activityElement.Attribute("Id").Value);
var activityName = activityElement.Attribute("Name").Value;
Logger.Information("Importing activity '{0}' with ID '{1}'.", activityName, localId);
var activity = new ActivityRecord {
Name = activityName,
Start = Boolean.Parse(activityElement.Attribute("Start").Value),
X = Int32.Parse(activityElement.Attribute("X").Value),
Y = Int32.Parse(activityElement.Attribute("Y").Value),
State = activityElement.Element("State").Value
};
activitiesDictionary.Add(localId, activity);
workflowDefinition.ActivityRecords.Add(activity);
}
foreach (var transitionElement in transitionsElement.Elements()) {
var sourceActivityId = Int32.Parse(transitionElement.Attribute("SourceActivityId").Value);
var sourceEndpoint = transitionElement.Attribute("SourceEndpoint").Value;
var destinationActivityId = Int32.Parse(transitionElement.Attribute("DestinationActivityId").Value);
var destinationEndpoint = transitionElement.Attribute("DestinationEndpoint").Value;
Logger.Information("Importing transition between activities '{0}' and '{1}'.", sourceActivityId, destinationActivityId);
workflowDefinition.TransitionRecords.Add(new TransitionRecord {
SourceActivityRecord = activitiesDictionary[sourceActivityId],
SourceEndpoint = sourceEndpoint,
DestinationActivityRecord = activitiesDictionary[destinationActivityId],
DestinationEndpoint = destinationEndpoint
});
}
}
catch (Exception ex) {
Logger.Error(ex, "Error while importing workflow '{0}'.", workflowName);
throw;
}
}
}
public void ExecuteRecipeStep(RecipeContext recipeContext) {
if (!String.Equals(recipeContext.RecipeStep.Name, "Workflows", StringComparison.OrdinalIgnoreCase)) {
return;
}
foreach (var workflowDefinitionElement in recipeContext.RecipeStep.Step.Elements()) {
var workflowDefinition = new WorkflowDefinitionRecord {
Name = ProbeWorkflowDefinitionName(workflowDefinitionElement.Attribute("Name").Value),
Enabled = Boolean.Parse(workflowDefinitionElement.Attribute("Enabled").Value)
};
_workflowDefinitionRepository.Create(workflowDefinition);
var activitiesElement = workflowDefinitionElement.Element("Activities");
var transitionsElement = workflowDefinitionElement.Element("Transitions");
var activitiesDictionary = new Dictionary<int, ActivityRecord>();
foreach (var activityElement in activitiesElement.Elements()) {
var localId = Int32.Parse(activityElement.Attribute("Id").Value);
var activity = new ActivityRecord {
Name = activityElement.Attribute("Name").Value,
Start = Boolean.Parse(activityElement.Attribute("Start").Value),
X = Int32.Parse(activityElement.Attribute("X").Value),
Y = Int32.Parse(activityElement.Attribute("Y").Value),
State = activityElement.Element("State").Value
};
activitiesDictionary.Add(localId, activity);
workflowDefinition.ActivityRecords.Add(activity);
}
foreach (var transitionElement in transitionsElement.Elements()) {
var sourceActivityId = Int32.Parse(transitionElement.Attribute("SourceActivityId").Value);
var sourceEndpoint = transitionElement.Attribute("SourceEndpoint").Value;
var destinationActivityId = Int32.Parse(transitionElement.Attribute("DestinationActivityId").Value);
var destinationEndpoint = transitionElement.Attribute("DestinationEndpoint").Value;
workflowDefinition.TransitionRecords.Add(new TransitionRecord {
SourceActivityRecord = activitiesDictionary[sourceActivityId],
SourceEndpoint = sourceEndpoint,
DestinationActivityRecord = activitiesDictionary[destinationActivityId],
DestinationEndpoint = destinationEndpoint
});
}
}
recipeContext.Executed = true;
}
private void StartWorkflow(WorkflowContext workflowContext, ActivityRecord activityRecord, IDictionary<string, object> tokens) {
// signal every activity that the workflow is about to start
var cancellationToken = new CancellationToken();
InvokeActivities(activity => activity.OnWorkflowStarting(workflowContext, cancellationToken));
if (cancellationToken.IsCancelled) {
// workflow is aborted
return;
}
// signal every activity that the workflow is has started
InvokeActivities(activity => activity.OnWorkflowStarted(workflowContext));
var blockedOn = ExecuteWorkflow(workflowContext, activityRecord, tokens).ToList();
// is the workflow halted on a blocking activity ?
if (!blockedOn.Any()) {
// no, nothing to do
}
else {
// workflow halted, create a workflow state
_workflowRepository.Create(workflowContext.Record);
foreach (var blocking in blockedOn) {
workflowContext.Record.AwaitingActivities.Add(new AwaitingActivityRecord {
ActivityRecord = blocking,
WorkflowRecord = workflowContext.Record
});
}
}
}
private ActivityContext CreateActivityContext(ActivityRecord activityRecord, IDictionary<string, object> tokens) {
return new ActivityContext {
Record = activityRecord,
Activity = _activitiesManager.GetActivityByName(activityRecord.Name),
State = new Lazy<dynamic>(() => GetState(activityRecord.State, tokens))
};
}
private string KeyFor(ActivityRecord record, string key)
{
return("@" + record.Id + "_" + key);
}
public object GetStateFor(ActivityRecord record, string key)
{
return(GetStateFor <object>(record, key));
}
public T GetStateFor <T>(ActivityRecord record, string key)
{
return(GetState <T>(KeyFor(record, key)));
}
public bool HasStateFor(ActivityRecord record, string key)
{
return(GetState(KeyFor(record, key)) != null);
}
public void SetStateFor <T>(ActivityRecord record, string key, T value)
{
SetState(KeyFor(record, key), value);
}